i have a chipeed ecu with the pwm mod went to get the car set up today...car kept over boosting...when the mechanic opened up ecu to have a look he ponted out a small adjustment screw wot does this do?

 

Pic?

 

That sounds very dodgy!!

 

adjustment screw wtf

 

WTF, he should be telling you this if you went to RR.
If he does not know how can you trust him to be competent enough to do job safely ?
Give us a piccie , but can only be trim setting for something, was it a screw or a pot ?
tabetha